Phase 41: Profile System Expansion

- ProfileType enum: Execution, Retrieval, Memory, Observer
- Per-type endpoints: /profiles/retrieval, /profiles/memory, /profiles/observer
- profile_type field on ModelProfile
- All tests pass

crates/shared/src/types.rs

@@ -269,6 +269,20 @@ pub struct ModelProfile {
     /// / 5M+ vector workloads.
     #[serde(default)]
     pub vector_backend: VectorBackend,
+    /// Phase 41: Profile type for routing + activation behavior.
+    /// Default Execution for backward compatibility.
+    #[serde(default)]
+    pub profile_type: ProfileType,
+}
+
+#[derive(Debug, Clone, Copy, PartialEq, Serialize, Deserialize, Default)]
+#[serde(rename_all = "snake_case")]
+pub enum ProfileType {
+    #[default]
+    Execution,
+    Retrieval,
+    Memory,
+    Observer,
 }
 
 fn default_embed_model() -> String { "nomic-embed-text".to_string() }